But but but you can integrate tanx can't you...?
Hmm not as good as the old classic though
x, x^2 and e^x went to a party. x and x^2 were having a great time, but e^x sat alone. x and x^2 went to see if they could help:
'hey, e^x, why don't you try and integrate?'
e^x: 'I just don't think it would change anything'
poor old e^x